CN106533152B - A kind of device and method improving Boost three-level converter PF - Google Patents

A kind of device and method improving Boost three-level converter PF Download PDF

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Publication number
CN106533152B
CN106533152B CN201611112825.8A CN201611112825A CN106533152B CN 106533152 B CN106533152 B CN 106533152B CN 201611112825 A CN201611112825 A CN 201611112825A CN 106533152 B CN106533152 B CN 106533152B
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circuit
digital
controller
voltage
output
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CN106533152A (en
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胡文斌
李冬莹
吕建国
俞爱娟
刘瑶秋
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Nanjing University of Science and Technology
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Nanjing University of Science and Technology
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00Details of apparatus for conversion
    • H02M1/42Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
    • H02M1/4208Arrangements for improving power factor of AC input
    • H02M1/4225Arrangements for improving power factor of AC input using a non-isolated boost converter
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00Details of apparatus for conversion
    • H02M1/12Arrangements for reducing harmonics from ac input or output
    • H02M1/126Arrangements for reducing harmonics from ac input or output using passive filters
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/02Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H02M7/12Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/21Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/217Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M7/2173Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only in a biphase or polyphase circuit arrangement
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00Details of apparatus for conversion
    • H02M1/0048Circuits or arrangements for reducing losses
    • H02M1/0054Transistor switching losses
    • H02M1/0058Transistor switching losses by employing soft switching techniques, i.e. commutation of transistors when applied voltage is zero or when current flow is zero
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P80/00Climate change mitigation technologies for sector-wide applications
    • Y02P80/10Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier

Abstract

The invention discloses a kind of device and methods for improving Boost three-level converter PF.The device includes main power circuit, digital process controller, signal conditioning circuit, driving circuit, auxiliary power supply circuit and the over-sampling modulate circuit of Boost three-level converter;This method passes through the rectified voltage of sampling diode rectifier circuit output and the output voltage of converter, it is exported after signal condition to the ADC module of digital process controller, ADC module send digital signal into the control algolithm of increase power factor after completing analog-to-digital conversion, and the duty ratio for completing the converter obtained after control operation is exported through the PWM module of digital process controller.The present invention can reduce the voltage stress of power switch tube, reduce the volume of inductance, reduce the loss of converter, improve the efficiency of converter, digital control operation is carried out using digital process controller, change the duty ratio of converter sinusoidally in half of power frequency period, power factor PF is improved to 1.

Description

A kind of device and method improving Boost three-level converter PF
Technical field
The invention belongs to the AC-DC converter field in electrical energy changer, especially a kind of tri- level of raising Boost The device and method of converter PF.
Background technique
With the development of power electronics technology, to Harmonics of Input in electrical energy changer and input power factor (Power Factor, PF) requires higher and higher, PFC (Power Factor Correction, PFC) converter It is widely applied.PFC technology is broadly divided into passive PFC technology and active PFC technology, and wherein active PFC technology uses work Make the Technics of Power Electronic Conversion circuit in high frequency, has many advantages, such as that small in size, light-weight, input power factor is high and high-efficient. The features such as Boost circuit because of its continuous input current, topological structure is simple, high-efficient is studied and applies in active PFC technology Widest topological structure.But because of the boosting characteristic of Boost circuit, in the case where high input voltage, corresponding high output electricity Pressure can make the storage capacitor overtension in circuit, and then power switch tube is made to bear very high voltage stress.In this way, on the one hand The switching loss and on-state loss of device are increased, on the other hand, power switch tube voltage stress is excessively high to be brought to parts selection Difficulty.The voltage stress of switching tube can be reduced to the 50% of two level Boosts by Boost three-level converter, be dropped simultaneously The low harmonic content of output voltage, using more extensive in high pressure, powerful occasion.
The control method of pfc converter can be divided into simulation control and it is digital control.By years of researches and development, simulation Control technology is highly developed, includes power factor in field of power supplies due to the simplicity and low cost of implementation of control method In correcting circuit, the dominance market share is accounted for.But simulating the limitation controlled, increasingly it is impossible to meet current higher energy Source standard requirements, the control method of pfc converter has the following problems at present: the voltage stress of power switch tube is high,.Inductance Volume is greatly and the loss of converter is serious, and the efficiency i.e. power factor of converter is caused to reduce.
Summary of the invention
The purpose of the present invention is to provide a kind of device and method for improving Boost three-level converter PF, can reduce The voltage stress of power switch tube reduces the volume of inductance, reduces the loss of converter, the efficiency of converter is improved, using number Word processing controller carries out digital control operation, becomes the duty ratio of converter sinusoidally in half of power frequency period Change, PF is improved to 1.
The technical solution for realizing the aim of the invention is as follows: a kind of device improving Boost three-level converter PF, including Main power circuit, digital process controller, signal conditioning circuit, driving circuit, auxiliary power supply circuit and over-sampling modulate circuit;
The main power circuit includes: input voltage source vin, electromagnetic interface filter, diode rectifier circuit RB, Boost inductance Lb, power switch tube Q1 and Q2, diode D1 and D2, storage capacitor C1 and C2 load RL;Input voltage source vinIt is filtered with EMI The input port of device connects, and the output port of electromagnetic interface filter is connect with the input port of diode rectifier circuit RB, and diode is whole The negative output terminal of current circuit RB is with reference to zero-potential point, the positive output end and Boost inductance L of diode rectifier circuit RBbOne End connection, Boost inductance LbThe other end respectively with the anode of the drain electrode of the first power switch tube Q1 and first diode D1 connect Connect, the cathode of first diode D1 respectively with the anode of the first storage capacitor C1 and load RLOne end connection, the first energy storage electricity Hold C1 cathode respectively with the source electrode of the first power switch tube Q1, the drain electrode of the second power switch tube Q2 and the second storage capacitor C2 Anode connection, the cathode of the second storage capacitor C2 respectively with the anode of the second diode D2 and load RLThe other end connection, The cathode of second diode D2 is connect with the negative output terminal of the source electrode of second switch Q2 and diode rectifier circuit RB respectively, main The voltage at the both ends diode rectifier circuit RB is rectified voltage V in power circuitg, load RLThe voltage at both ends is output voltage Vo
The digital process controller includes: ADC module, control algolithm and PWM module, rectified voltage VgAnd output voltage VoThe ADC module of digital process controller is accessed after over-sampling modulate circuit, the output of ADC module is sent to digital processing and controlled The result of the control algolithm of device, control algolithm is exported by PWM module to signal conditioning circuit;
The pwm signal that the signal conditioning circuit inputs digital process controller carries out conditioning amplification, signal condition electricity The output end on road and the input terminal of driving circuit connect;
The control signal of driving circuit output respectively with the first switch tube Q1 and second switch of main power circuit The grid of Q2 is connected;
The output of auxiliary power supply circuit is respectively connected to digital process controller, signal conditioning circuit, driving circuit and sampling Conditioning circuit, the effect of auxiliary power supply circuit are to provide electric energy to chip operation in above-mentioned each circuit;
Two input terminals of the over-sampling modulate circuit respectively in main power circuit diode rectifier circuit RB it is just defeated Outlet and the load R being connected with the first storage capacitor C1 anodeLOne end be connected, the rectified voltage V of samplinggAnd output voltage VoIt is connected after conditioning with the ADC module input terminal of digital process controller.
A method of improving Boost three-level converter PF, comprising the following steps:
Step 1, the rectified voltage V of over-sampling modulate circuit acquisition main power circuitgWith output voltage Vo, improved through overvoltage After the input voltage range met the requirements afterwards, it is sent into the ADC module of digital process controller;
Step 2, it after voltage analog signal is converted to digital signal by the ADC module of digital process controller, send to number In the control algolithm of the increase power factor of processing controller;
Step 3, the duty of converter is carried out in the control algolithm module of the increase power factor of digital process controller Than controlling operation, change the duty ratio of converter sinusoidally in half of power frequency period;
Step 4, it is exported through controlling the duty cycle control signal that operation obtains through the PWM module of word processing controller, PWM letter Number by driving two power switch tubes in main power circuit after signal conditioning circuit and driving circuit.
Compared with prior art, the present invention its remarkable advantage are as follows: (1) can reduce the voltage stress of power switch tube;(2) Switching frequency is the 1/2 of current ripples frequency, can further decrease the volume of inductance;(3) reduction of voltage stress and frequency makes The loss of converter reduces, and improves the efficiency of converter;(4) digital process controller can faster realize high density meter Control algolithm is calculated, power factor is improved to 1.
Detailed description of the invention
Fig. 1 is the main circuit diagram of Boost three-level PFC converter.
Fig. 2 is current waveform figure of the Boost inductance in a switch periods under DCM mode.
Fig. 3 is the PF value curve graph determined under duty ratio control.
Fig. 4 is the waveform diagram of variable duty cycle expression formula.
Fig. 5 is Boost three-level PFC converter and its control circuit schematic diagram under DCM mode.
Specific embodiment
With reference to the accompanying drawing and specific embodiment makes further description to the present invention.
The present invention devises a kind of device and method for improving Boost three-level converter PF.
The theory deduction of Boost three-level PFC converter under 1.DCM mode:
For convenience of analysis, first make as follows: 1. all devices are ideal element;2. output voltage ripple and its DC quantity phase Compare very little;3. switching frequency is much higher than input voltage frequency.
Fig. 1 is the main circuit diagram of Boost three-level PFC converter, and in a switch periods, Boost three-level PFC becomes Two switching tube alternate conductions of parallel operation, Fig. 2 give converter work in discontinuous current mode (DCM) mode, and one is opened Close the voltage and current waveform of inductance in the period.As seen from the figure, switching frequency is the 1/2 of current ripples frequency, inductance electricity Stream can be analyzed in half of switch periods, and this characteristic that high frequency is controlled with low frequency can not only make the volume of inductance It is further to reduce, and the loss switched is also reduced.When two power switch tubes Q1 and Q2 are simultaneously turned on, inductance LbThe voltage at both ends is vg, inductive current iLbStart from scratch with vg/LbSlope linear rise, energy storage is in inductance, energy storage Capacitor C1 and C2 are load R jointlyLEnergy is provided;When switching tube Q1 conducting Q2 shutdown, diode D1 bears backward voltage and closes It is disconnected, diode D2 conducting, inductance LbThe voltage at both ends is vg-VC1, inductive current linear decline requirement vg<VC1, when two energy storage The equal i.e. V of capacitor's capacityC1=VC2=Vo/ 2, inductance LbThe voltage at both ends is vg-Vo/ 2, inductive current iLbWith (vg-Vo/2)/Lb Slope linear decline, at this time storage capacitor C2 charge, C1 electric discharge.Before half of switch periods terminates, inductive current iLbIt is reduced to 0, storage capacitor C1 and C2 are load R jointlyLEnergy is provided.The analysis of half of switch periods is similar with above-mentioned analysis afterwards.
Define input ac voltage vin(t) are as follows:
vin(t)=Vmsin(ωt) (1)
Wherein VmIt is the amplitude of input ac voltage, ω is the angular frequency of input ac voltage.
So, input voltage vin(t) the rectified voltage v obtained after diode rectifier circuit RB rectificationgAre as follows:
vg=Vm|sin(ωt)| (2)
In a switch periods, the peak value of inductive current are as follows:
The identical duty ratio of two of them switching tube Q1, Q2 is D, TsFor switch periods.
In each switch periods, inductance LbThe volt-seconds area at both ends is equal, it may be assumed that
Wherein storage capacitor voltage isDrFor inductive current be reduced to zero corresponding to duty ratio.
It is obtained by formula (2) and formula (4):
It can be obtained by formula (3) and formula (5), inductive current i in a switch periodsLbAverage value iLb_avAre as follows:
Wherein fsFor switching frequency.
So input current are as follows:
Mean Input Power P in power frequency periodinAre as follows:
Wherein TlineFor the input ac voltage period.
Assuming that transducer effciency is 100%, then input power is equal to output power, i.e. Pin=Po, can must be accounted for by formula (9) Sky ratio D are as follows:
Expression formula can be worth in the hope of PF by formula (7) and formula (9):
The PF value curve determined under duty ratio control can be made according to formula (12), as shown in Figure 3.It can be seen from the figure that working as Output voltage VoOne timing, VmBigger, corresponding PF value is smaller, and Boost three-level PFC converter compares traditional two level and becomes Parallel operation, in the case where power device rated value is constant, output voltage be can be improved to twice, therefore can be exported by improving The voltage class of voltage improves PF value, but PF value is still by input voltage amplitude and output voltage ratioThe influence of variation.Cause This, needs to propose new method to improve PF value.
2. improving the derivation and realization of the variable duty cycle control method of PF value:
(7) formula of observation, if taking duty ratio
Then input current changes are as follows:
If duty ratio changes according to formula (13) in a power frequency period, work as DoWhen by taking constant, input current formula (14) be sine wave, and with input voltage same-phase, exactly make PF=1.
By formula (1) and formula (14), the Mean Input Power P of converter can be derivedinAre as follows:
As available from the above equation:
It brings formula (16) into formula (13), can obtain:
The gained variable duty cycle D it can be seen from formula (17)ySinusoidally change in power frequency period, is about defeated Enter voltage vin(t) function, it is possible to make input current and input voltage same-phase, PF value reaches 1.Variable duty cycle expression formula Waveform diagram it is as shown in Figure 4.
3. a kind of device and method for improving Boost three-level converter PF of the present invention
In conjunction with Fig. 5, the device of Boost three-level converter PF, including main power circuit 1, digital process controller are improved 2, signal conditioning circuit 3, driving circuit 4, auxiliary power supply circuit 5 and over-sampling modulate circuit 6;
The main power circuit 1 includes: input voltage source vin, electromagnetic interface filter, diode rectifier circuit RB, Boost inductance Lb, power switch tube Q1 and Q2, diode D1 and D2, storage capacitor C1 and C2 load RL;Input voltage source vinIt is filtered with EMI The input port of device connects, and the output port of electromagnetic interface filter is connect with the input port of diode rectifier circuit RB, and diode is whole The negative output terminal of current circuit RB is with reference to zero-potential point, the positive output end and Boost inductance L of diode rectifier circuit RBbOne End connection, Boost inductance LbThe other end respectively with the anode of the drain electrode of the first power switch tube Q1 and first diode D1 connect Connect, the cathode of first diode D1 respectively with the anode of the first storage capacitor C1 and load RLOne end connection, the first energy storage electricity Hold C1 cathode respectively with the source electrode of the first power switch tube Q1, the drain electrode of the second power switch tube Q2 and the second storage capacitor C2 Anode connection, the cathode of the second storage capacitor C2 respectively with the anode of the second diode D2 and load RLThe other end connection, The cathode of second diode D2 is connect with the negative output terminal of the source electrode of second switch Q2 and diode rectifier circuit RB respectively, main The voltage at the both ends diode rectifier circuit RB is rectified voltage V in power circuit 1g, load RLThe voltage at both ends is output voltage Vo
The digital process controller 2 includes: ADC module, control algolithm and PWM module, rectified voltage VgWith output electricity Press VoThe ADC module of digital process controller 2 is accessed after over-sampling modulate circuit 6, the output of ADC module is sent to digital processing The result of the control algolithm of controller 2, control algolithm is exported by PWM module to signal conditioning circuit (3);
The pwm signal that the signal conditioning circuit 3 inputs digital process controller 2 carries out conditioning amplification, signal condition The output end of circuit 3 is connect with the input terminal of driving circuit 4;
The control signal that the driving circuit 4 exports respectively with the first switch tube Q1 and second switch of main power circuit 1 The grid of pipe Q2 is connected;
The output of the auxiliary power supply circuit 5 is respectively connected to digital process controller 2, signal conditioning circuit 3, driving circuit 4 and over-sampling modulate circuit 6, the effect of auxiliary power supply circuit 5 is to provide electric energy to chip operation in above-mentioned each circuit;
Two input terminals of the over-sampling modulate circuit 6 respectively with diode rectifier circuit RB in main power circuit 1 just Output end and the load R being connected with the first storage capacitor C1 anodeLOne end be connected, the rectified voltage V of samplinggWith output electricity Press VoIt is connected after conditioning with the ADC module input terminal of digital process controller 2.
Preferably, the digital process controller 2 uses dsp chip TMS320F28335.
The method of present invention raising Boost three-level converter PF, comprising the following steps:
Step 1, over-sampling modulate circuit 6 acquires the rectified voltage V of main power circuit 1gWith output voltage Vo, through overvoltage tune After the input voltage range met the requirements after reason, it is sent into the ADC module of digital process controller 2;
Step 2, it after voltage analog signal is converted to digital signal by the ADC module of digital process controller 2, send to number In the control algolithm of the increase power factor of processing controller 2;
Step 3, the duty of converter is carried out in the control algolithm module of the increase power factor of digital process controller 2 Than controlling operation, change the duty ratio of converter sinusoidally in half of power frequency period;
The control algolithm of the increase power factor of the digital process controller 2 uses changing rule are as follows:
Duty ratio control operation, wherein VoFor the output of main power circuit 1 Voltage, PoFor the output power of main power circuit 1, VmFor the peak value of the input ac voltage of main power circuit 1, ω is that input is handed over The angular frequency of galvanic electricity pressure, LbFor Boost inductance value, fsFor switching frequency.
Step 4, it is exported through controlling the duty cycle control signal that operation obtains through the PWM module of digital process controller 2, Pwm signal by after signal conditioning circuit 3 and driving circuit 4, drive two power switch tube Q1 in main power circuit 1 and Q2。
In conclusion can reduce the invention discloses a kind of device and method for improving Boost three-level converter PF The voltage stress of power switch tube reduces the volume of inductance, reduces the loss of converter, the efficiency of converter is improved, using number Word processing controller carries out digital control operation, becomes the duty ratio of converter sinusoidally in half of power frequency period Change, power factor is improved to 1, has many advantages, such as High Power Factor, high power density, facilitate realization.

Claims (1)

1. a kind of method for improving Boost three-level converter PF, which is characterized in that the device of use includes main power circuit (1), digital process controller (2), signal conditioning circuit (3), driving circuit (4), auxiliary power supply circuit (5) and sampling conditioning electricity Road (6);
The main power circuit (1) includes: input voltage source vin, electromagnetic interface filter, diode rectifier circuit RB, Boost inductance Lb, power switch tube Q1 and Q2, diode D1 and D2, storage capacitor C1 and C2 load RL;Input voltage source vinIt is filtered with EMI The input port of device connects, and the output port of electromagnetic interface filter is connect with the input port of diode rectifier circuit RB, and diode is whole The negative output terminal of current circuit RB is with reference to zero-potential point, the positive output end and Boost inductance L of diode rectifier circuit RBbOne End connection, Boost inductance LbThe other end respectively with the anode of the drain electrode of the first power switch tube Q1 and first diode D1 connect Connect, the cathode of first diode D1 respectively with the anode of the first storage capacitor C1 and load RLOne end connection, the first energy storage electricity Hold C1 cathode respectively with the source electrode of the first power switch tube Q1, the drain electrode of the second power switch tube Q2 and the second storage capacitor C2 Anode connection, the cathode of the second storage capacitor C2 respectively with the anode of the second diode D2 and load RLThe other end connection, The cathode of second diode D2 connects with the negative output terminal of the source electrode of the second power switch tube Q2 and diode rectifier circuit RB respectively It connects, the voltage at the both ends diode rectifier circuit RB is rectified voltage V in main power circuit (1)g, load RLThe voltage at both ends is defeated Voltage V outo
The digital process controller (2) includes: ADC module, control algolithm module and PWM module, rectified voltage VgWith output electricity Press VoThe ADC module of digital process controller (2) is accessed after over-sampling modulate circuit (6), the output of ADC module is sent to number The result of the control algolithm module of processing controller (2), control algolithm module is exported by PWM module to signal conditioning circuit (3);
The pwm signal that digital process controller (2) inputs is carried out conditioning amplification, signal condition by the signal conditioning circuit (3) The output end of circuit (3) is connect with the input terminal of driving circuit (4);
The control signal of the driving circuit (4) output respectively with the first power switch tube Q1 of main power circuit (1) and second The grid of power switch tube Q2 is connected;
The output of the auxiliary power supply circuit (5) is respectively connected to digital process controller (2), signal conditioning circuit (3), driving electricity Road (4) and over-sampling modulate circuit (6), the effect of auxiliary power supply circuit (5) are to provide electric energy to chip operation in above-mentioned each circuit;
Two input terminals of the over-sampling modulate circuit (6) respectively with diode rectifier circuit RB in main power circuit (1) just Output end and the load R being connected with the first storage capacitor C1 anodeLOne end be connected, the rectified voltage V of samplinggWith output electricity Press VoIt is connected after conditioning with the ADC module input terminal of digital process controller (2);
The method for improving Boost three-level converter PF, comprising the following steps:
Step 1, the rectified voltage V of over-sampling modulate circuit (6) acquisition main power circuit (1)gWith output voltage Vo, through overvoltage tune After the input voltage range met the requirements after reason, it is sent into the ADC module of digital process controller (2);
Step 2, it after voltage analog signal is converted to digital signal by the ADC module of digital process controller (2), send to number In the control algolithm module for managing the increase power factor of controller (2);
Step 3, the duty ratio of converter is carried out in the control algolithm module of the increase power factor of digital process controller (2) Operation is controlled, changes the duty ratio of converter sinusoidally in half of power frequency period;
Step 4, it is exported through controlling the duty cycle control signal that operation obtains through the PWM module of digital process controller (2), PWM Two power switch tube Q1 after signal is by signal conditioning circuit (3) and driving circuit (4), in driving main power circuit (1) And Q2;
The control algolithm module of the increase power factor of digital process controller described in step 3 (2) uses changing rule are as follows:
Duty ratio control operation, wherein VoFor the defeated of main power circuit (1) Voltage out, PoFor the output power of main power circuit (1), VmFor the peak value of the input ac voltage of main power circuit (1), ω is The angular frequency of input ac voltage, LbFor Boost inductance value, fsFor switching frequency.
CN201611112825.8A 2016-12-07 2016-12-07 A kind of device and method improving Boost three-level converter PF Expired - Fee Related CN106533152B (en)

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